Patents by Inventor Sudha Chopra

Sudha Chopra has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Toner mass control by surface roughness and voids
    Patent number: 8500616
    Abstract: The present disclosure relates to controlling a performance characteristic of an image forming device component having a surface which may include removal of a portion of the surface to expose a plurality of voids and a surface between the voids. The surface between the voids may have a surface roughness Ra in the range of 0.1 to 5.0 microns and the relationship SAV/(SAV+SAC) is equal to 1-50%, where SAV is the surface area of the voids and SAC is the remaining surface area of the component. The performance characteristic may include the control of toner mass conveyed and/or toner filming and/or the amount of residual toner removed from a photoconductive surface.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: August 6, 2013
    Assignee: Lexmark International, Inc.
    Inventors: Johnathan Lee Barnes, Jeannette Quinn Bracken, Sudha Chopra, Jeremy Lavern Daum, Gerald Lee Fish, Bhaskar Gopalanarayanan, Leea Danielle Haarz, Ronald Lloyd Roe, Matthew Joe Russell, James Joseph Semler, Todd Joseph Svoboda
  • Toner Mass Control by Surface Roughness and Voids
    Publication number: 20090092420
    Abstract: The present disclosure relates to controlling a performance characteristic of an image forming device component having a surface which may include removal of a portion of the surface to expose a plurality of voids and a surface between the voids. The surface between the voids may have a surface roughness Ra in the range of 0.1 to 5.0 microns and the relationship SAV/(SAV+SAC) is equal to 1-50%, where SAV is the surface area of the voids and SAC is the remaining surface area of the component. The performance characteristic may include the control of toner mass conveyed and/or toner filming and/or the amount of residual toner removed from a photoconductive surface.
    Type: Application
    Filed: October 9, 2007
    Publication date: April 9, 2009
    Inventors: Johnathan Lee Barnes, Jeanette Quinn Bracken, Sudha Chopra, Jeremy Lavern Daum, Gerald Lee Fish, Bhaskar Gopalanarayanan, Leea Danielle Haarz, Ronald Lloyd Roe, Matthew Joe Russell, James Joseph Semler, Todd Joseph Svoboda
  • Radiation cured coatings
    Publication number: 20070237925
    Abstract: A radiation cured coating may be applied to a device in an image forming apparatus. The coating may be textured using an embossing method wherein radiation is passed through an embossing device to react a chemical component of the coating. The coating may also be textured by providing multiple coating layers exhibiting differential shrinkage upon exposure to radiation and reacting.
    Type: Application
    Filed: April 7, 2006
    Publication date: October 11, 2007
    Inventors: Scott Castle, Sudha Chopra, Marc Cousoulis, Gary Denton, Bhaskar Gopalanarayanan, Bart Mansdorf, Vernon Ulrich, Mark Weisman
  • Belt fuser belt
    Patent number: 6818290
    Abstract: This invention comprises a fuser belt (1) of polyimide incorporating surface-oxidized boron nitride. The resulting enhanced flexibility provides continuing strength without physical damage during use of the belt in a belt fuser while thermal conductivity is preserved. The extent of flexibility enhancement observed is dependent on the degree of oxidation. Therefore, oxidation temperature and time of oxidation are key variables that are used to control the degree of oxidation and thereby the resulting improvement in the flex fatigue.
    Type: Grant
    Filed: September 29, 2003
    Date of Patent: November 16, 2004
    Assignee: Lexmark International, Inc.
    Inventors: Sudha Chopra, Ronald Lloyd Roe, Mark Stephen Weisman, Jr.